[Linux] Shell Script ๊ธฐ์ดˆ ๋ฌธ๋ฒ• - ์ •๊ทœ ํ‘œํ˜„์‹

2025. 6. 1. 23:50ยทLinux
๋”๋ณด๊ธฐ
๋”๋ณด๊ธฐ

์ฒ˜์Œ ๋ฐฐ์šฐ๋Š” ์…ธ ์Šคํฌ๋ฆฝํŠธ ์ฑ… ์ฐธ๊ณ 

์ •๊ทœ ํ‘œํ˜„์‹

POSIX ๊ธฐ๋ณธ ๋ฐ ํ™•์žฅ ๋ฌธ๋ฒ•

์ •๊ทœ ํ‘œํ˜„์‹ โžก๏ธ ์ผ์น˜ํ•˜๋Š” ํ…์ŠคํŠธ๋ฅผ ์ฐพ๊ธฐ ์œ„ํ•œ ํŒจํ„ด์„ ํ‘œํ˜„ํ•˜๊ธฐ ์œ„ํ•ด ์‚ฌ์šฉ๋˜๋Š” ํŠน์ • ํ‘œ์ค€ ํ…์ŠคํŠธ์˜ ๋ฌธ๋ฒ•์„ ์˜๋ฏธ.
ํŒจํ„ด์„ ๊ธฐ์ˆ ํ•˜๋Š” ๋ฌธ์ž์—ด ๋‚ด์˜ ๊ฐ ๋ฌธ์ž๋“ค์€ ๋ฉ”ํƒ€ ๋ฌธ์ž๋‚˜ ์ •๊ทœ ๋ฌธ์ž๋กœ ์ดํ•ด๋จ.

๋ฉ”ํƒ€ ๋ฌธ์ž ์„ค๋ช…
. ๋‰ด๋ผ์ธ์„ ์ œ์™ธํ•œ ํ•œ ๊ฐœ์˜ ๋ฌธ์ž์™€ ์ผ์น˜.
? ์ž์‹  ์•ž์— ๋‚˜์˜ค๋Š” ์ •๊ทœ ํ‘œํ˜„์‹์ด ์—†๊ฑฐ๋‚˜ ํ•˜๋‚˜๊ฐ€ ์ผ์น˜ํ•˜๋ฉฐ, ๋Œ€๋ถ€๋ถ„ ํ•œ ๊ฐœ์˜ ๋ฌธ์ž์™€ ๋งค์นญํ•  ๋•Œ ์‚ฌ์šฉ.
* ๋ฐ”๋กœ ์•ž ๋ฌธ์ž์—ด์ด๋‚˜ ์ •๊ทœ ํ‘œํ˜„์‹์—์„œ ํ•œ ๋ฒˆ ์ด์ƒ ๋ฐ˜๋ณต๋˜๋Š” ๋ฌธ์ž๋ฅผ ์˜๋ฏธ.
+ ์ž์‹   ์•ž์— ๋‚˜์˜ค๋Š” ํ•˜๋‚˜ ์ด์ƒ์˜ ์ •๊ทœ ํ‘œํ˜„์‹๊ณผ ์ผ์น˜. *๊ณผ ๋น„์Šทํ•˜๊ฒŒ ๋™์ž‘ํ•˜์ง€๋งŒ ๋ฐ˜๋“œ์‹œ ํ•˜๋‚˜ ์ด์ƒ์ผ ๊ฒฝ์šฐ์—๋งŒ ์ผ์น˜.
{N} ์ •ํ™•ํžˆ N๋ฒˆ ์ผ์น˜.
{N,} N๋ฒˆ ๋˜๋Š” ๊ทธ ์ด์ƒ ์ผ์น˜.
{N, M} ์ ์–ด๋„ N๋ฒˆ ์ผ์น˜ํ•˜์ง€๋งŒ, M๋ฒˆ ์ผ์น˜๋ฅผ ๋„˜์ง€ ์•Š์•„์•ผ ํ•จ.
- A๋ถ€ํ„ฐ Z๋ฅผ A-Z๋กœ ํ‘œํ˜„ํ•˜๋“ฏ์ด ์•ŒํŒŒ๋ฒณ์ด๋‚˜ ์ˆซ์ž์˜ ๋ฒ”์œ„๋ฅผ ๋‚˜ํƒ€๋‚ผ ๋•Œ ์‚ฌ์šฉ.
^ ๋ผ์ธ์˜ ์‹œ์ž‘์—์„œ ๊ณต๋ฐฑ ๋ฌธ์ž์—ด์„ ์˜๋ฏธ. ๋ชฉ๋ก์˜ ๋ฒ”์œ„์— ์—†๋Š” ๋ฌธ์ž๋“ค์„ ์˜๋ฏธ.
$ ๋ผ์ธ ๋งˆ์ง€๋ง‰์—์„œ ๊ณต๋ฐฑ ๋ฌธ์ž์—ด์„ ์˜๋ฏธ.
^$ ๋นˆ ์ค„๊ณผ ์ผ์น˜.
[...] ๋Œ€๊ด„ํ˜ธ๋Š” ๋‹จ์ผ ์ •๊ทœ ํ‘œํ˜„์‹์—์„œ ๋ฌธ์ž๋“ค์„ ์ง‘ํ•ฉ์œผ๋กœ ๋ฌถ์–ด์คŒ.
\ ํŠน์ˆ˜ ๋ฌธ์ž๋ฅผ ์›๋ž˜์˜ ๋ฌธ์ž ์˜๋ฏธ๋Œ€๋กœ ํ•ด์„.
\b ๋‹จ์–ด ๋์˜ ๊ณต๋ฐฑ ๋ฌธ์ž์—ด์„ ์˜๋ฏธ.
\B ๋ผ์ธ ๋์˜ ๊ณต๋ฐฑ ๋ฌธ์ž์—ด์„ ์˜๋ฏธ.
\< ๋‹จ์–ด ์‹œ์ž‘์—์„œ ๊ณต๋ฐฑ ๋ฌธ์ž์—ด์„ ์˜๋ฏธ.
\> ๋‹จ์–ด ๋์—์„œ ๊ณต๋ฐฑ ๋ฌธ์ž์—ด์„ ์˜๋ฏธ.

POSIX ๋ฌธ์žํด๋ž˜์Šค

์ฐพ๊ณ ์ž ํ•˜๋Š” ๋ฌธ์ž์—ด์˜ ์ข…๋ฅ˜.
๋ฌธ์ž ํด๋ž˜์Šค์—๋Š” ์•ŒํŒŒ๋ฒณ, ์•ŒํŒŒ๋ฒณ ์†Œ๋ฌธ์ž, ์•ŒํŒŒ๋ฒณ ๋Œ€๋ฌธ์ž, ์ˆซ์ž ๊ทธ๋ฆฌ๊ณ  ํŠน์ˆ˜ ๋ฌธ์ž๋“ค์ด ์žˆ์Œ.

POSIX ์„ค๋ช…
[:alnum] ์•ŒํŒŒ๋ฒณ์ด๋‚˜ ์ˆซ์ž๋กœ ์ด๋ฃจ์–ด์ง„ ๋ฌธ์ž์—ด๋กœ [A-Za-z0-9]์™€ ๊ฐ™์€ ํ‘œํ˜„.
[:alpha:] ์•ŒํŒŒ๋ฒณ ๋ฌธ์ž๋ฅผ ์˜๋ฏธํ•˜๋ฉฐ, [A-Za-z]์™€ ๊ฐ™์€ ํ‘œํ˜„.
[:blank:] ์ŠคํŽ˜์ด์Šค๋‚˜ ํƒญ์„ ์˜๋ฏธ.
[:cntrl:] ์ œ์–ด ๋ฌธ์ž๋“ค์„ ์˜๋ฏธ.
[:digit:] 0~9 ์‚ฌ์ด์˜ ์ˆซ์ž๋ฅผ ์˜๋ฏธํ•˜๋ฉฐ, [0-9]์™€ ๊ฐ™์€ ํ‘œํ˜„.
[:graph:] ์ถœ๋ ฅ ๊ฐ€๋Šฅํ•œ ๊ทธ๋ž˜ํ”ฝ ๋ฌธ์ž๋“ค๋กœ, ASCII 33~126 ์‚ฌ์ด์˜ ๋ฌธ์ž๋“ค๊ณผ ์ผ์น˜.
์ŠคํŽ˜์ด์Šค ๋ฐ ์ œ์–ด ๋ฌธ์ž๋“ค์„ ์ œ์™ธํ•œ [:print:]์™€ ๊ฐ™์Œ.
[:lower:] ์•ŒํŒŒ๋ฒณ ์†Œ๋ฌธ์ž๋ฅผ ์˜๋ฏธํ•˜๋ฉฐ [a-z]์™€ ๊ฐ™์€ ํ‘œํ˜„.
[:print:] ์ถœ๋ ฅ ๊ฐ€๋Šฅํ•œ ๋ฌธ์ž๋“ค๋กœ ASCII 32~126 ์‚ฌ์ด์˜ ๋ฌธ์ž๋“ค๊ณผ ์ผ์น˜.
[:graph:]์™€ ๋น„์Šทํ•˜์ง€๋งŒ ์ŠคํŽ˜์ด์Šค ๋ฌธ์ž๋ฅผ ํฌํ•จ.
[:punct:] ๋ฌธ์žฅ ๋ถ€ํ˜ธ ๋ฌธ์ž๋“ค์„ ์˜๋ฏธ.
[:space:] ๋‰ด๋ผ์ธ ์ค„๋ฐ”๊ฟˆ, ์ŠคํŽ˜์ด์Šค, ํƒญ๊ณผ ๊ฐ™์€ ๋ชจ๋“  ๊ณต๋ฐฑ ๋ฌธ์ž๋“ค์„ ์˜๋ฏธ.
[:upper:] ์•ŒํŒŒ๋ฒณ ๋Œ€๋ฌธ์ž๋ฅผ ์˜๋ฏธํ•˜๋ฉฐ [A-Z]์™€ ๊ฐ™์€ ํ‘œํ˜„.
[:xdigit:] 16์ง„์ˆ˜์˜ ์ˆซ์ž์™€ ๋ฌธ์ž๋ฅผ ์˜๋ฏธํ•˜๋ฉฐ [0-9a-fA-F]์™€ ๊ฐ™์€ ํ‘œํ˜„.

์˜ˆ์ œ

๋ฉ”ํƒ€ ๋ฌธ์ž .์„ ์ด์šฉํ•  ๊ฒฝ์šฐ

# C๋กœ ์‹œ์ž‘ํ•ด U๋กœ ๋๋‚˜๋Š” ์„ธ ๊ธ€์ž ๋‹จ์–ด์—ฌ์•ผ ํ•˜๋ฉฐ, ๊ฐ€์šด๋ฐ ํ•œ ๊ธ€์ž๋Š” ์–ด๋–ค ๋ฌธ์ž๊ฐ€ ์™€๋„ ๊ด€๊ณ„โŒ
~$ grep 'C.U' expression.txt
CPU model is Intel(R) Core(TM) i7-8665U CPU @ 1.90GHz
# C๋กœ ์‹œ์ž‘ํ•ด e๋กœ ๋๋‚˜๋Š” ๋„ค ๊ธ€์ž ๋‹จ์–ด์—ฌ์•ผ ํ•˜๋ฉฐ, ๊ฐ€์šด๋ฐ ๋‘ ๊ธ€์ž๋Š” ์–ด๋–ค ๋ฌธ์ž๊ฐ€ ์™€๋„ ๊ด€๊ณ„โŒ
~$ grep 'C..e' expression.txt
CPU model is Intel(R) Core(TM) i7-8665U CPU @ 1.90GHz

๋ฉ”ํƒ€ ๋ฌธ์ž *, \, ?์™€ ๋ฌธ์žํด๋ž˜์Šค [:lower:]๋ฅผ ์ด์šฉํ•  ๊ฒฝ์šฐ

# q๋กœ ์‹œ์ž‘ํ•˜๋ฉฐ ?๋กœ ๋๋‚˜๋Š” ๋‹จ์–ด์—ฌ์•ผ ํ•˜๋ฉฐ q์™€ ? ์‚ฌ์ด๋Š” ์˜๋ฌธ์†Œ๋ฌธ์ž์ธ ๋‹จ์–ด
~$ grep -E 'q[[:lower:]]*\?' expression.txt
Do you have any questions? or Do you need any help?
# q๋กœ ์‹œ์ž‘ํ•˜๋ฉฐ ?๋กœ ๋๋‚˜๊ฑฐ๋‚˜ ๊ทธ์™ธ ํ•œ๋ฌธ์ž๋กœ ๋๋‚˜๋Š” ๋‹จ์–ด์—ฌ์•ผ ํ•˜๋ฉฐ q์™€ ? ์‚ฌ์ด๋Š” ์˜๋ฌธ์†Œ๋ฌธ์ž์ธ ๋‹จ์–ด
~$ grep -E 'q[[:lower:]]*\??' expression.txt
Do you have any questions? or Do you need any help?
If you have any questions, Please send a mail to the email below.

๋ฉ”ํƒ€ ๋ฌธ์ž +์™€ ^๋ฅผ ์ด์šฉํ•  ๊ฒฝ์šฐ

# -2๋กœ ์‹œ์ž‘ํ•ด -๋กœ ๋๋‚˜๋ฉฐ, 2๊ฐ€ ๊ณ„์† ๋ฐ˜๋ณต๋˜๋Š” ๋‹จ์–ด
~$ grep -E '\-2+\-' expression.txt
phone: 010-2222-5668
# ๋ผ์ธ ์‹œ์ž‘ ๋ฌธ์ž๊ฐ€ #์œผ๋กœ ์‹œ์ž‘๋˜๋Š” ๋ผ์ธ
~$ grep '^#' expression.txt
#===========================================#
# Date: 2020-05-05
# Author: NaleeJang
# Description: regular expression test file
#===========================================#
# System Information
# Help
# Contacts

๋ฉ”ํƒ€ ๋ฌธ์ž ^, {N}, {N,} ๊ทธ๋ฆฌ๊ณ , ๋ฌธ์žํด๋ž˜์Šค [:alpha:]๋ฅผ ์ด์šฉํ•  ๊ฒฝ์šฐ

# ๋ผ์ธ ์‹œ์ž‘ ์‹œ ์•ŒํŒŒ๋ฒณ 5๊ธ€์ž๋กœ ์‹œ์ž‘ํ•˜๋ฉฐ, ์•ŒํŒŒ๋ฒณ ๋’ค์— : ์œผ๋กœ ๋๋‚˜๋Š” ๋‹จ์–ด๊ฐ€ ์žˆ๋Š” ๋ผ์ธ
~$ grep -E '^[[:alpha:]]{5}:' expression.txt
phone: 010-2222-5668
# ๋ผ์ธ ์‹œ์ž‘ ์‹œ ์•ŒํŒŒ๋ฒณ 5๊ธ€์ž ์ด์ƒ์ด๋ฉฐ, ๋’ค์— ๊ณต๋ฐฑ์„ ๊ฐ€์ง„ ๋‹จ์–ด๊ฐ€ ์žˆ๋Š” ๋ผ์ธ
~$ grep -E '^[[:alpha:]]{5,}[[:space:]]' expression.txt
Today is 05-May-2020.
Current time is 6:04PM.
Memory size is 32GiB

๋ฉ”ํƒ€ ๋ฌธ์ž {N, M}, $ ๊ทธ๋ฆฌ๊ณ  ๋ฌธ์žํด๋ž˜์Šค [:alpha:] [:digit:]์„ ์ด์šฉํ•  ๊ฒฝ์šฐ

# ๋ผ์ธ ์ข…๋ฃŒ ์‹œ ์•ŒํŒŒ๋ฒณ 4๊ธ€์ž ์ด์ƒ 6๊ธ€์ž ์ดํ•˜์ธ ๋‹จ์–ด๊ฐ€ ์žˆ๋Š” ๋ผ์ธ
~$ grep -E '[[:alpha:]]{4,6}$' expression.txt
 Regular Expression
# Author: NaleeJang
# Description: regular expression test file
# System Information
# Help
# Contacts

# ๋ผ์ธ ์ข…๋ฃŒ ์‹œ ์ˆซ์ž 4๊ธ€์ž ์ด์ƒ 6๊ธ€์ž ์ดํ•˜์ธ ๋‹จ์–ด๊ฐ€ ์žˆ๋Š” ๋ผ์ธ
~$ grep -E '[[:digit:]]{4,6}.$' expression.txt
Today is 05-May-2020.

๋ฉ”ํƒ€ ๋ฌธ์ž ^, ^$๋ฅผ ์ด์šฉํ•  ๊ฒฝ์šฐ

# ๋ผ์ธ ์‹œ์ž‘ ์‹œ #์œผ๋กœ ์‹œ์ž‘ํ•˜๊ณ , ๊ณต๋ฐฑ์ธ ๋ผ์ธ ์ œ๊ฑฐ
~$ cat expression.txt | grep -v '^#' | grep -v '^$'
====================
 Regular Expression
====================

Today is 05-May-2020.
Current time is 6:04PM.
This is an example file for testing regular expressions.        This example file includes control characters.
CPU model is Intel(R) Core(TM) i7-8665U CPU @ 1.90GHz
Memory size is 32GiB
Disk is 512 GB
IP Address is 192.168.35.7
Do you have any questions? or Do you need any help?
If you have any questions, Please send a mail to the email below.
e-mail: nalee999@gmail.com
phone: 010-2222-5668

๋ฉ”ํƒ€ ๋ฌธ์ž \,\b, \B๋ฅผ ์ด์šฉํ•  ๊ฒฝ์šฐ

#. ์œผ๋กœ ๋๋‚˜๋Š” ๋‹จ์–ด๊ฐ€ ์žˆ๋Š” ๋ผ์ธ
~$ grep '\.\b' expression.txt
CPU model is Intel(R) Core(TM) i7-8665U CPU @ 1.90GHz
IP Address is 192.168.35.7
e-mail: nalee999@gmail.com
# .์ด ์žˆ๋Š” ๋ผ์ธ
~$ grep '\.' expression.txt
Today is 05-May-2020.
Current time is 6:04PM.
This is an example file for testing regular expressions.        This example file includes control characters.
CPU model is Intel(R) Core(TM) i7-8665U CPU @ 1.90GHz
IP Address is 192.168.35.7
If you have any questions, Please send a mail to the email below.
e-mail: nalee999@gmail.com
# .์œผ๋กœ ๋๋‚˜๋Š” ๋ผ์ธ
~$ grep '\.\B' expression.txt
Today is 05-May-2020.
Current time is 6:04PM.
This is an example file for testing regular expressions.        This example file includes control characters.
If you have any questions, Please send a mail to the email below.

๋ฉ”ํƒ€ ๋ฌธ์ž \<. \>๋ฅผ ์ด์šฉํ•  ๊ฒฝ์šฐ

# C๋กœ ์‹œ์ž‘ํ•˜๋Š” ๋‹จ์–ด๊ฐ€ ์žˆ๋Š” ๋ผ์ธ
~$ grep '\<C' expression.txt
Current time is 6:04PM.
CPU model is Intel(R) Core(TM) i7-8665U CPU @ 1.90GHz
# Contacts

# n์œผ๋กœ ๋๋‚˜๋Š” ๋‹จ์–ด๊ฐ€ ์žˆ๋Š” ๋ผ์ธ
~$ grep 'n\>' expression.txt
 Regular Expression
# Description: regular expression test file
This is an example file for testing regular expressions.        This example file includes control characters.
# System Information

๋ฌธ์žํด๋ž˜์Šค [:cntrl:] [:graph:]๋ฅผ ์ด์šฉํ•  ๊ฒฝ์šฐ

# ํŠน์ˆ˜ ๋ฌธ์ž๊ฐ€ ํฌํ•จ๋œ ๋ผ์ธ. expressions์™€ This ์‚ฌ์ด์—๋Š” Tab ๋ฌธ์ž๊ฐ€ ์žˆ์Œ.
~$ grep '[[:cntrl:]]' expression.txt
This is an example file for testing regular expressions.        This example file includes control characters.

# ์•„์Šคํ‚ค ์ฝ”๋“œ๊ฐ€ ์žˆ๋Š” ๋ชจ๋“  ๋ผ์ธ
~$ grep '[[:graph:]]' expression.txt | head -n 10
====================
 Regular Expression
====================
#===========================================#
# Date: 2020-05-05
# Author: NaleeJang
# Description: regular expression test file
#===========================================#
Today is 05-May-2020.
Current time is 6:04PM.

๋ฌธ์žํด๋ž˜์Šค [:print:]๋ฅผ ์ด์šฉํ•  ๊ฒฝ์šฐ

# ์ŠคํŽ˜์ด์Šค๋ฅผ ํฌํ•จํ•œ ์•„์Šคํ‚ค ์ฝ”๋“œ๊ฐ€ ์žˆ๋Š” ๋ชจ๋“  ๋ผ์ธ
~$ grep '[[:print:]]' expression.txt | head -n 10
====================
 Regular Expression
====================

#===========================================#
# Date: 2020-05-05
# Author: NaleeJang
# Description: regular expression test file
#===========================================#
Today is 05-May-2020.

๋ฉ”ํƒ€ ๋ฌธ์ž {N,}๊ณผ ๋ฌธ์žํด๋ž˜์Šค [:alpha:] [:punct:]๋ฅผ ์ด์šฉํ•  ๊ฒฝ์šฐ

# ์•ŒํŒŒ๋ฒณ 6๊ธ€์ž ์ด์ƒ์ด๋ฉฐ, ๋ฌธ์žฅ ๋ถ€ํ˜ธ๋กœ ๋๋‚˜๋Š” ๋‹จ์–ด๊ฐ€ ์žˆ๋Š” ๋ผ์ธ
~$ grep -E '[[:alpha:]]{6,}[[:punct:]]' expression.txt
# Author: NaleeJang
# Description: regular expression test file
This is an example file for testing regular expressions.        This example file includes control characters.
Do you have any questions? or Do you need any help?
If you have any questions, Please send a mail to the email below.

๋ฉ”ํƒ€ ๋ฌธ์ž \<. \>, *, {N}๊ณผ ๋ฌธ์žํด๋ž˜์Šค [:xdigit:]์„ ์ด์šฉํ•  ๊ฒฝ์šฐ

~$ ip a | grep -E '\<[[:xdigit:]]{2}:*:[[:xdigit:]]{2}\>'

๋ฌธ์žํด๋ž˜์Šค [:xdigit:]์€ 16์ง„์ˆ˜์— ํ•ด๋‹นํ•˜๋Š” ๋ฌธ์ž๋“ค๋งŒ ํ—ˆ์šฉ. IPv6์™€ ๊ฐ™์€ ์ฃผ์†Œ๋ฅผ ๊ฒ€์ƒ‰ํ•  ๊ฒฝ์šฐ ๋‹จ์–ด ์‹œ์ž‘๊ณผ ๋์„ ์˜๋ฏธํ•˜๋Š” ๋ฉ”ํƒ€ ๋ฌธ์ž \<. \>์™€ ๊ฒ€์ƒ‰ํ•œ ๋ฌธ์žํด๋ž˜์Šค๊ฐ€ ๋ช‡ ๋ฒˆ ๋ฐ˜๋ณต๋˜๋Š”์ง€๋ฅผ ๋ฉ”ํƒ€ ๋ฌธ์ž {N}๋ฅผ ์‚ฌ์šฉํ•˜๋ฉด ์‰ฝ๊ฒŒ ๊ฒ€์ƒ‰ ๊ฐ€๋Šฅ.

์ €์ž‘์žํ‘œ์‹œ ๋น„์˜๋ฆฌ ๋ณ€๊ฒฝ๊ธˆ์ง€ (์ƒˆ์ฐฝ์—ด๋ฆผ)

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